|Publication number||US7614504 B2|
|Application number||US 11/137,875|
|Publication date||Nov 10, 2009|
|Filing date||May 26, 2005|
|Priority date||Feb 16, 2004|
|Also published as||CN101184544A, CN101184544B, DE112006001365T5, US20060186036, WO2007070083A1|
|Publication number||11137875, 137875, US 7614504 B2, US 7614504B2, US-B2-7614504, US7614504 B2, US7614504B2|
|Inventors||Kevin C. South, Ismail C. Bagci, Gregory W. Hoverson|
|Original Assignee||Cummins Filtration Ip Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (37), Non-Patent Citations (1), Referenced by (3), Classifications (18), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present application is a continuation-in-part patent application of U.S. patent application Ser. No. 10/778,694, filed Feb. 16, 2004, now U.S. Pat. No. 7,434,697, by inventors Ismail C. Bagci, et al., entitled “A DISPOSABLE, SPIN-ON FILTER”, which application is expressly incorporated herein by reference in its entirety.
The present invention relates in general to fluid filters and the selected design for connecting the filter to a mounting base or head. More specifically, the present invention relates to a spin-on filter that is constructed and arranged without using a nutplate for connecting the filter to a mounting base or head. By eliminating the nutplate, the resultant fluid filter is less expensive to fabricate, including cost savings by eliminating one of the component parts. A related benefit is the ability to have a mostly non-metallic construction for the fluid filter that in turn allows it to be considered “disposable” since it can be incinerated for disposal or recycling. By providing a construction that is incinerable, the structural mass of the filter can be reduced to low volume ash and this limits what will be added to landfills. The other option for “disposal” is to recycle the plastics used in the construction. Presently, when there is an all-plastic construction for a filter, it is generally described as having an “environmentally friendly green design”.
In one embodiment of the present invention, the focus is directed to a fluid filter construction that consists mostly or predominantly of non-metallic components and is considered to be disposable. This embodiment does not include the traditional nutplate for threaded connection to the head. Instead, the open end of the shell is externally threaded for connection to the head, enabling the elimination of the nutplate. In a related embodiment of the present invention, the filter housing or shell is a “hybrid” in that it includes both metal and plastic. This related embodiment also does not include the traditional nutplate for threaded connection to the head.
Typical spin-on fluid filters according to prior art designs are mounted to the head (spud) by the use of an internally-threaded metal nutplate. The nutplate is anchored to the fluid filter canister and includes at least one flow inlet and a flow exit cooperating with a centertube. The filter-to-head mounting includes a seal to prevent leakage between the head and the filter. Flow to the filter travels by way of the head and, once it is filtered, the fluid exits by way of the head. In order to fabricate a fluid filter using a nutplate, there are costs associated with the fabrication of the nutplate and costs associated with assembly of the nutplate into the fluid filter. If the nutplate could be eliminated from the fluid filter, these costs would be saved. While there may be, on a limited basis, other techniques used for connecting a fluid filter to a mounting head, one aspect of the present invention is directed to the elimination of any nutplate from the fluid filter. A consequence of this design is the elimination of the nutplate for use in connection to the head.
The present invention provides a fluid filter design that is capable of spin-on, threaded mounting to a head without using a nutplate. A typical prior art mounting head includes an externally-threaded post or portion that is received by the internally-threaded nutplate. With a non-nutplate construction, according to the present invention, the spin-on fluid filter attaches to the head by way of the externally threaded open end of the fluid filter shell. In the fluid filter construction disclosed by U.S. patent application Ser. No. 10/778,694, a threaded post is configured as part of the closed end of the canister and connects to a shaft (internally-threaded) that extends beyond the head into the spin-on filter. As described therein, there are various alternative embodiments. These embodiments include, among other features, fixing the shaft as part of the fluid filter and connecting the shaft to a cooperating portion of the head. It should also be understood that the use of “spin-on” to describe the fluid filter of the present invention is intended to include not only threaded engagement, but other connection techniques, such as the use of a bayonet connection between the fluid filter and the mounting head. Related to a bayonet connection are quarter-turn and half-turn connections that may assume a variety of structural forms.
With respect to the “hybrid” shell embodiment of the present invention, it is appropriate to discuss potential concerns with an all-plastic, unitary shell or housing. It is believed that an all-plastic construction, with threads on the outside diameter of the shell adjacent the open end, lends itself well to smaller diameters and shorter lengths, such as shells that are less than 7 inches tall. However, as fluid filters become larger in terms of the diameter and height, the unitary construction using all plastic can become technically and/or financially limiting. For example, additional amounts of plastic may be required in order to maintain the required strength for the higher stress levels. The injection molding tooling becomes more costly and the injection molding process requires a press design with larger tonnage. Using a hybrid shell with a metal body and a plastic sleeve for the threaded end of the metal body, according to the present invention, addresses some of these concerns.
A fluid filter constructed and arranged for threaded engagement with a fluid-delivery head according to one embodiment of the present invention comprises a fluid filter shell having a sidewall formed with a retaining ridge, a fluid filter media pack installed into the fluid filter shell, the fluid filter media pack including filtering media and an upper endplate bonded to an upper end of the filtering media and the upper endplate including a peripheral lip that is constructed and arranged to snap into position axially beneath the retaining ridge.
One object of the present invention is to provide an improved fluid filter.
Related objects and advantages of the present invention will be apparent from the following description.
For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated device, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates.
The present invention includes, as one component, a fluid filter shell that is preferably a unitary, molded plastic component. This construction comprises the preferred embodiment of the present invention, even though occasionally concerns have been raised regarding a unitary plastic construction for fluid filter shells having larger diameters and heights exceeding approximately 7 or 8 inches. For these larger shell sizes, when there is a desire to shift from plastic to metal, the present invention includes a hybrid construction with a metal shell body and a molded plastic sleeve that includes an insert-molded metal ring.
Referring first to
The insert-molded metal ring 22 b is preferably fabricated out of steel and is used to seam together the sleeve 22 and the deep drawn steel shell body 21. In order to accomplish this seaming operation, the steel shell body is fabricated with an annular, radial flange 31 adjacent open end 24 (see
With the lower end of sleeve 22 inserted down into the shell body before the seaming operation begins, the shell body 21 and sleeve 22 are then securely joined together in order to create a hybrid (plastic and metal) fluid filter shell 20. As will be described hereinafter in connection with a second embodiment of the present invention, the fluid filter media pack or filter cartridge to be used with the selected shell is secured with a snap-fit or alternatively with a press-in interference fit. These two embodiments apply regardless of whether the hybrid shell 20 is utilized or a unitary, molded plastic shell is used. These assembly options are described in greater detail in connection with the second embodiment of the present invention in terms of a unitary, molded plastic shell. Nevertheless, these two assembly options are equally applicable to this first embodiment of the hybrid fluid filter shell.
The preferred embodiment of the present invention includes a unitary, molded plastic fluid filter shell 34. One representative construction of this preferred design is illustrated in
Since the present invention includes a wide open shell in terms of open end 39 and no nutplate, the specific construction of the media pack 36 and its relationship to shell 34 are important. Media pack 36 includes the filtering media 40 that is constructed and arranged in a generally cylindrical form and a cooperating upper endplate 41 that is securely bonded to the filtering media 40. As would be understood for filter modules of this type, the center of the filtering media has a hollow cylindrical form for the upward passage of fluid after passing through the filtering media.
While the opposite or lower face 45 of the filtering media 40 must be closed off by some style of endplate 46 to preclude bypassing the filtering media, its construction relative to the other components is not critical since it has no interfacing properties in a structural sense relative to the fluid filter shell 34. Although the lower face 45 of the filtering media 40 and endplate 46 are effectively suspended in the interior of the fluid filter shell and do not pose any interference or abutment concerns, the arrangement that enables this suspended condition is important in terms of how the fluid filter media pack 36 interfaces with fluid filter shell 34 once the shell is threaded into engagement with the fluid-delivery head 37. It is also important to position the upper endplate 41 at the correct location relative to the interior of head 37 once the fluid filter shell 34 is completely or fully threaded into head 37.
Referring now to
The fluid to be filtered and flowing into fluid filter 35 from head 37 finds its way to the six, equally-spaced openings 50. This fluid is drawn through the filtering media 40 and flows out through sleeve 48 back into head 37. In order for this flow pattern to be realized in a uniform, reliable, and leak-free manner, the upper endplate 41 is securely bonded to the upper end or face 52 of filtering media 40. This secure connection between the endplate 41 and the filtering media 40 is also important in terms of how the fluid filter media pack 36 is assembled into the fluid filter shell 34 and how this media pack is suspended in the shell, as is illustrated in
In the preferred embodiment of the present invention, the fluid filter media pack 36 snaps into fluid filter shell 34 by the cooperative assembly of lip 49 of endplate 41, specifically sections 51 being positioned beneath an inwardly directed annular retaining ridge 56 that is unitarily molded as part of the inner surface 57 of fluid filter shell 34 (see
While retaining ridge 56 is preferably of an annular form, an alternative is to configure the ridge into sections with an alternating clearance space between adjacent sections. Since the media pack 36 is non-directional in terms of how it inserts into fluid filter shell 34, the only caveat as to the ridge sections is that they must retain the media pack. This then becomes an issue of the ridge section circumferential lengths and the circumferential length of each lip section 51. In a worst-case orientation, there needs to be sufficient overlap in order to securely retain the media pack 36 in the fluid filter shell 34.
Once assembled in this fashion, any attempt to pull fluid filter media pack 36 out of the fluid filter shell 34 causes the upper, outer portion of each section 51 to abut up against the underside surface of retaining ridge 56 and this abutment prevents the removal of fluid filter media pack 36. This result is achieved whether the retaining ridge 56 is annular or segmented. In terms of describing this as preventing removal, it should be understood that if the fluid filter media pack 36 is crushed or destroyed in some fashion, such that the individual sections 51 might clear the retaining ridge 56, then the fluid filter media pack 36 might be able to be removed. However, due to this snap-in assembly technique, and in view of the materials and the positioning of the various components relative to each other, any attempt to cut, crush, snap, bend, or sever the individual sections 51 or other portions of media pack 36 are considered to be high risk in terms of possible damage to shell 34 and clearly require a substantially time investment. This in part is why this preferred embodiment of the present invention is considered to a fully-disposable fluid filter. In terms of the present invention, the concept of being fully disposable includes the substantially or predominantly all plastic construction and the ability to incinerate the used fluid filter 35 once the filtering media 40 becomes clogged with filtered particulate, at least to the degree that its filtering ability has dropped to an unacceptable level. Another aspect of being fully disposable, in terms of the entire fluid filter 35, is that the plastic construction for the component parts contributes to a lower cost design that one can afford to dispose of once the filtering media is clogged.
Referring now to
A third embodiment (see
In each of the three fluid filter embodiments disclosed herein, the option exists of using the hybrid fluid filter shell 20. However, it should be recognized that the use of metal (steel) for the shell body 21 has an effect on the disposable status since the metal cannot be incinerated for effective disposal and the cost is greater than plastic. This of course may result in something of a trade off in terms of cost depending on the additional plastic that may have to be used for higher stress levels. Since the third embodiment (see
When the fluid filter is threaded into head 37 (for any of the disclosed embodiments), the inner sleeve 77 of head 37 receives the upper end of sleeve 48 and extends in the direction of channel 73 so as to compress sealing gasket 72. The action of the head 37 pushing down on gasket 72 as the threaded engagement occurs, both compresses gasket 72 and applies a downward axial force on the fluid filter media pack 36. In order to maintain the fluid filter media pack 36 in a fixed position relative to the fluid filter shell 34 so that adequate gasket compression is achieved, the inside surface 78 of the fluid filter shell 34 is formed with axially-extending ribs 79 (see
As can be seen from
While the invention has been illustrated and described in detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character, it being understood that only the preferred embodiment has been shown and described and that all changes and modifications that come within the spirit of the invention are desired to be protected.
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|U.S. Classification||210/443, 210/445, 210/444, 210/450, 210/455, 210/440|
|International Classification||B01D35/30, B01D35/28, B01D27/08|
|Cooperative Classification||B01D35/30, B01D27/08, B01D2201/304, B01D2201/291, B01D2201/4084, B01D29/111|
|European Classification||B01D35/30, B01D29/11B, B01D27/08|
|Jun 28, 2005||AS||Assignment|
Owner name: FLEETGUARD, INC., TENNESSEE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SOUTH, KEVIN C.;BAGCI, ISMALL C.;HOVERSON, GREGORY W.;REEL/FRAME:016431/0981;SIGNING DATES FROM 20050523 TO 20050525
|Feb 27, 2009||AS||Assignment|
Owner name: CUMMINS FILTRATION INC.,TENNESSEE
Free format text: CHANGE OF NAME;ASSIGNOR:FLEETGUARD, INC.;REEL/FRAME:022322/0656
Effective date: 20060524
|Mar 2, 2009||AS||Assignment|
Owner name: CUMMINS FILTRATION IP INC.,MINNESOTA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CUMMINS FILTRATION INC.;REEL/FRAME:022330/0815
Effective date: 20090218
|May 10, 2013||FPAY||Fee payment|
Year of fee payment: 4